Refrigerator



FIG. 1 is a side perspective view of a refrigerator, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a first side view thereof;

FIG. 4 is a second side view thereof; and,

FIG. 5 is a top view thereof. 

The ornamental design for a refrigerator, as shown and described. 